The FASA RPG's The Federation has Elaan marry "the son of Troyius's current ruler", while The Orions: Book of Common Knowledge says she married "the Prefect-King of Troyius, Cosalthan II". Meanwhile, the STreference: Star Trek Maps says she married "the Troyian Prefect", which may be the same as the Prefect-King, or perhaps a lesser, prince-like role. The Decipher RPG's Worlds has her marry "the Principus of Troyius". These do not necessarily contradict; taken together, it seems likely that the Prefect/Principus is the son of the Prefect-King, or another name for the position, and Cosalthan II became king shortly before, during or shortly after his marriage to Elaan. Finally, the TOSnovel: Firestorm instead states that Elaan was married to Bejas, the leader of Troyius.

Both Orions and Troyians are known for their green skin. The placement of an Orion Colony on this world may have been intended to suggest a shared heritage, but the source gives no indication of this, and even separates the two communities.

The Federation makes Troyians blue-skinned with no mention of antennae, and has the first Andorian colonization of another world occur in stardate −1/96 (1996), though this may also be a transplantation by the Preservers or another race. It is not clear, then, who else lived on Troyius at the time of the Sooris sacking, but these theories may be in error.

The war continued on into the mid-23rd century. Both powers made contact with the Federation in 2258, and soon after became members, but continued to skirmish with each other. (Decipher RPGmodule: Worlds) By this time, the Troyians had managed to fight the Elasians to a draw. (FASA RPGmodule: The Federation)

The USS Enterprise was sent to serve as ambassador, aiding peace negotiations and escorting Elaan to Troyius for the marriage. Despite Klingon interference, Elasian sabotage and Elaan's reluctance, the mission was successful. (TOSepisode: "Elaan of Troyius")

Though Klingons made further attempts to disrupt the peace and gain access to the dilithium deposits, the Tellun system remained stable. (FASA RPGmodule: The Federation)

In the twenty years after Federation contact, Troyius flourished and prospered thanks to its influence. Troyius committed itself to developing interstellar trade, and the merchant fleet was improved. A modern spaceport was constructed at the capital of Troilus, and the Interplanetary Bazaar enabled the trade of goods. (FASA RPGmodule: The Orions: Book of Common Knowledge)

Troyius developed into a major dilithium supplier for Starfleet and the Federation.

The peace between Troyius and Elas continued through the late 23rd and 24th centuries, with no significant violations of their treaty. However, renewed warfare remained a topic of great concern for the Federation, especially during the Federation-Cardassian War and the Dominion War, given the risk to Starfleet's dilithium supply. (Decipher RPGmodule: Worlds)